update sources to Ubuntu-5.15.0-23.23

(generated with debian/scripts/import-upstream-tag)

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

diff --git a/submodules/ubuntu-jammy b/submodules/ubuntu-jammy
index f4c13e3c7e92851b6fb8b9aa7d1d61568628ca6d..3fe20881e51fb8db498e80639935992df3931254 160000 (submodule)
--- a/submodules/ubuntu-jammy
+++ b/submodules/ubuntu-jammy
@@ -1 +1 @@
-Subproject commit f4c13e3c7e92851b6fb8b9aa7d1d61568628ca6d
+Subproject commit 3fe20881e51fb8db498e80639935992df3931254